ORIGINAL: Blow n Go
The wing rock happens as a wing gets enough lift to start flying again. Once it produces lift, it also produces drag and the resulting yaw, it moves itself out of the airflow and drives the opposite wing into the airflow. The first wing then looses lift and the opposite one now has enough airflow that it begins to fly, and the process amplifies.
The problem is compounded by the fact part of your rudder is blanketed by the elevator during a harrier, and the rudder is what you need to stop the rocking. Swept wings increase the effect - jets call it "dutch roll" and have yaw dampers to prevent it......not aileron dampers, but yaw (rudder) dampers!
The lower your forward speed, the less tendancy the plane will have to enter the oscillation. On calm days you will probably have little trouble with wingrock. Windy days will help inititate the rocking. On a windy day your plane is moving faster through the air - even though it may not be moving at all over the ground. That forward speed will make it easier for the wing to get lift to begin the rocking. Gusts will also start the rocking. Once it starts it only gets worse until you do something to stop it.
That's the theory - now to work with it........
Stop it by adding rudder to counter the rocking. You have to lead your application, though. The rudder has some lag involved wiith it, so you have to apply it before it is actually needed. For example: If you wait until the left wing is up to add left rudder, the plane will start to reverse on its own about the same time the rudder takes effect.......so the right wing comes up with a vengence. You have to add the left rudder when the left wing just starts to rise, and release it as it passes level.
Aileron will not help as the wing doesn't have an efficient airflow over it. Adding aileron will increase drag on the low wing and make the yaw worse, so the rocking gets worse. Remember, it is a YAW problem, not a roll problem. The rolling is a result of the yaw.
By the way, most planes don't start the rocking in an inverted harrier. Can you guess why? Just remember that your rudder is reversed in the inverted harrier. (ie. use left rudder to raise the wing on the right and vice versa).
Bottom line.........lots of practice using rudder! Have fun.........
CJ
Wing rocking:
It occurs because the plane is constantly trying to stall due to being nose heavy or not enough elevator throw, or both. Most planes do it worse upright because the majority of there weight is above the centerline of the wing. Inverted it is below the centerline.
Chip